wolffd@0: function b = backT(engine, f, t)
wolffd@0: 
wolffd@0: if t==1
wolffd@0:   [b.clpot, seppot] = distribute_evidence(engine.jtree_engine1, f.clpot, f.seppot);
wolffd@0: else
wolffd@0:   [b.clpot, seppot] = distribute_evidence(engine.jtree_engine, f.clpot, f.seppot);
wolffd@0: end
wolffd@0: for c=1:length(b.clpot)
wolffd@0:   [b.clpot{c}, ll(c)] = normalize_pot(b.clpot{c});
wolffd@0: end
wolffd@0: b.t = t;